diff --git a/tests/rpc/frontend.py b/tests/rpc/frontend.py
index eff41738a..eace07bf9 100644
--- a/tests/rpc/frontend.py
+++ b/tests/rpc/frontend.py
@@ -31,7 +31,7 @@ end
 
 import json
 import argparse
-import sys, socket, os
+import sys, socket, os, subprocess
 try:
 	import msvcrt, win32pipe, win32file
 except ImportError:
@@ -85,6 +85,7 @@ def main():
 		sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
 		sock.bind(args.path)
 		try:
+			ys_proc = subprocess.Popen(["../../yosys", "-ql", "unix.log", "-p", "connect_rpc -path {}; read_verilog design.v; hierarchy -top top; flatten; select -assert-count 1 t:$neg".format(args.path)])
 			sock.listen(1)
 			conn, addr = sock.accept()
 			file = conn.makefile("rw")
@@ -93,7 +94,11 @@ def main():
 				if not input: break
 				file.write(call(input) + "\n")
 				file.flush()
+			ys_proc.wait(timeout=10)
+			if ys_proc.returncode:
+				raise subprocess.CalledProcessError(ys_proc.returncode, ys_proc.args)
 		finally:
+			ys_proc.kill()
 			sock.close()
 			os.unlink(args.path)
 
diff --git a/tests/rpc/run-test.sh b/tests/rpc/run-test.sh
index 44ce7e674..eeb309347 100755
--- a/tests/rpc/run-test.sh
+++ b/tests/rpc/run-test.sh
@@ -4,3 +4,4 @@ for x in *.ys; do
   echo "Running $x.."
   ../../yosys -ql ${x%.ys}.log $x
 done
+python3 frontend.py unix-socket frontend.sock
diff --git a/tests/rpc/unix.ys b/tests/rpc/unix.ys
deleted file mode 100644
index cc7ec14ab..000000000
--- a/tests/rpc/unix.ys
+++ /dev/null
@@ -1,6 +0,0 @@
-!python3 frontend.py unix-socket frontend.sock & sleep 0.1
-connect_rpc -path frontend.sock
-read_verilog design.v
-hierarchy -top top
-flatten
-select -assert-count 1 t:$neg